What would cause the brake pedal to drop when the engine is started

Asked by Blue1966 Nov 22, 2014 at 06:21 PM about the 1966 Ford Thunderbird

Question type: Maintenance & Repair

After replacing the master cylinder on a 66 T Bird the brake pedal now goes to the floor
when the engine is started, this must be an issue with the booster

5 Answers
15,935

Larry answered 10 years ago

Check all your vacuum lines to the booster. There is probably a "Y" connector and one line may be off or loose.

1 people found this helpful.
Mark helpful
20

Jaylud answered 8 years ago

What ended up being the problem? I have the same issue. Thanks

2 people found this helpful.
Mark helpful
15,935

Larry answered 8 years ago

65 &6 have two different connectors to the booster. one is a "Y" and the other is just a straight through. Be sure to listen to you engine when it starts and see if you can hear a hissing sound. That would be a vacuum leak somewhere.

1 people found this helpful.
Mark helpful

Your Answer:

Related Questions

Thunderbird

Looking for a Used Thunderbird in your area?

CarGurus has 28 nationwide Thunderbird listings starting at $14,888.

Postal Code:

Shortcuts

Search Ford Thunderbird Questions

CarGurus Experts

  • #1
    Larry Sturgis
    Reputation
    3,020
  • #2
    Gene Arnett
    Reputation
    2,080
  • #3
    MrBlueOval
    Reputation
    1,580
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford Mustang
58 Great Deals out of 1,366 listings starting at $4,995
Used Chevrolet Corvette
27 Great Deals out of 1,082 listings starting at $15,000
Used Chevrolet Camaro
20 Great Deals out of 281 listings starting at $7,995
Used Mercedes-Benz SL-Class
10 Great Deals out of 141 listings starting at $13,869
Used Pontiac Firebird
14 listings
Used Ford Bronco
22 Great Deals out of 1,281 listings starting at $37,000
Used Dodge Charger
39 Great Deals out of 725 listings starting at $5,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.